Segment Information and Foreign Operations - Product Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue by product type
Revenue	$ 27,923	$ 18,595	$ 50,611	$ 38,000
Substrates
Revenue by product type
Revenue	19,745	11,027	36,648	24,516
Raw materials and others
Revenue by product type
Revenue	$ 8,178	$ 7,568	$ 13,963	$ 13,484

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details